The Hail Golem is a mob from the Weather Mobs Idea Pack. It spawns quite rarely during hailstorms (about as commonly as Witches). It will attack all hostile mobs it sees with Hail. This Hail behaves exactly like normal Hail.
Hail Golems can also be created by placing 2 Hail Blocks on top of each other with a Pumpkin on top.
Reactions to Biomes
In the Nether, Jungles, Deserts, Savannas, or Mesas, Hail Golems will quickly die. This makes their use slightly limited; however, a Splash Potion of Fire Resistance will remedy this for a while.
Similarity to Snow Golems
Hail Golems have a bluer touch to them than Snow Golems. Their surface also looks more pebbled.